Insulating material.



UNITED STATES PATENT OFFICE.

Specification'of Letters Patent.

Patented. Feb. 6, 1906.

Application filed It}! 11, 1905. Serial No. 259,994.

To all whom/ it may concern.-

Be it known that I, CHARLES C. HALL, a citizen of the United States,residing at Alexandria, in the county of Madison and State of 5,Indiana, have invented a new and useful Insulating Material, of whichthe following is a specification.

'{his invention relates to insulating materia The object of theinvention is in a ready,

cheap, and thoroughl practical manner to render either sheet-as estos ormineral wool absolutely waterproof, whereby when employed as aninsulator or lagging for cold- 5 storage buildings, packing-houses,breweries, ice p ants, refrigerators, and the like it will be absolutelyproof against absorption of moisture, there y in an appreciable mannerincreasing the refrigeratin properties of such buildings by conservintheice or other refrigerant and measure 1y reducin the expense incidentto maintaining such uildings or inclosures at the desired degree oftemperature. 2 5 With the above and other objects in view, as wiilappear as the nature of the invention is better understood, the sameconsists in the novel insulatin material, as will be hereinafter fullydescribed and claimed.

In carrying the invention into'effect there is taken any desiredquantity of divided or comminuted asbestos or mineral wool of commerce,preferably about ninety-two per cent., by weight, of the entire bulk ofthe 3 5 substance to be made, to which is added about eight or cent. bwei ht, of a suitable bindersncli as groun woo -pulp or paper stock,starch, flour, glue, or any other sine able adhesive or um or sodiumsilieateand 40 the massisthen t oroughly mixed in anysuitable manner andformed into blocks, slabs,

or boards of any desired size and form. The roportion of the binder tothe asbestos herein stated has been found best adapted for the purposesdefined, for the reason that by addm only a comparatively small roortion o the binder to the asbestos t e re,- proof qualities of thelatter will not be detracted from, while there will be sufiioient of thebinder to render the article stable and perfectly adapted to the uses towhich it will e put. After (1 g, the product thus 7. formed is saturatewith a suitable watermixture of asbestos and ground wood-pulfp inproofing material, which may be composed of paraffin-wax, stearin,taiiow, or asphaltum dissolved in a suitablesolvent-such as naphtha,gasoiene, benzin, bisulfid of carbonin the proportion of one ound, moreor less, of araiiin or the like and two and one-half galons, more orless, of the solvent. The treat- 6:: ed asbestos or mineral wool isallowed to become thoroughly saturated with the fluid, af ter which itis immediately placed in an airtight chamber, and the solventis removedby a vacuum-pump and is then condensed in any suitab e manner. By savingthe solvent, which is the most expensive lngredient employed, theproduction of the material is reduced to a minimum, and the solvent thatis saved may be reused a large number of times by merely adding theretothe quantity lost by evaporation while the material is being saturated.After the material is thoroughly dry it is removed from the chamber andis then ready for use. The product re- 7 5 sulting from this procedureis compact and thoroughly moisture-proof, will float indefinitely uponwater, and will not deteriorate with age. The treatment causes the waxor the like to ermeate and coat the cells and interstices o the moldedasbestos or mineral wool, so that from core to surface it is renderedabsolutely water roof.

The proportions of t e ingredients stated are those that have been foundthoroughly 5 effective in use; but it is to be understood that theinvention is not to be limited thereto, as they may be varied or changedunder certain conditions and still be within the sec e of the invention.0 avi thus described the invention, What is claime is- An insulatingmaterial consisting of a comthe proportion of ninety-two per cent. 0asbestos and eight per cent. of wood-pulp, and an ole inous substancewith which the compound 1s permeated throughout.

' In testimony that I claim the foregoing as my own I have heretoaflixed my signature in too the presence of two witnesses.

CHARLES o. HALL. Witnesses:

B. H. BALL, Jno. McKan.

